mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-13 14:46:53 +00:00
d25126faae
This patch fixes a problem I accidentally introduced in an instruction combine on select instructions added at r227197. That revision taught the instruction combiner how to fold a cttz/ctlz followed by a icmp plus select into a single cttz/ctlz with flag 'is_zero_undef' cleared. However, the new rule added at r227197 would have produced wrong results in the case where a cttz/ctlz with flag 'is_zero_undef' cleared was follwed by a zero-extend or truncate. In that case, the folded instruction would have been inserted in a wrong location thus leaving the CFG in an inconsistent state. This patch fixes the problem and add two reproducible test cases to existing test 'InstCombine/select-cmp-cttz-ctlz.ll'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229124 91177308-0d34-0410-b5e6-96231b3b80d8
328 lines
9.8 KiB
LLVM
328 lines
9.8 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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; This test is to verify that the instruction combiner is able to fold
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; a cttz/ctlz followed by a icmp + select into a single cttz/ctlz with
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; the 'is_zero_undef' flag cleared.
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define i16 @test1(i16 %x) {
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; CHECK-LABEL: @test1(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %x, i1 false)
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; CHECK-NEXT: ret i16 [[VAR]]
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entry:
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%0 = tail call i16 @llvm.ctlz.i16(i16 %x, i1 true)
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%tobool = icmp ne i16 %x, 0
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%cond = select i1 %tobool, i16 %0, i16 16
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ret i16 %cond
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}
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define i32 @test2(i32 %x) {
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; CHECK-LABEL: @test2(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 false)
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; CHECK-NEXT: ret i32 [[VAR]]
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entry:
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%0 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i32 %0, i32 32
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ret i32 %cond
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}
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define i64 @test3(i64 %x) {
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; CHECK-LABEL: @test3(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %x, i1 false)
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; CHECK-NEXT: ret i64 [[VAR]]
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entry:
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%0 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
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%tobool = icmp ne i64 %x, 0
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%cond = select i1 %tobool, i64 %0, i64 64
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ret i64 %cond
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}
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define i16 @test4(i16 %x) {
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; CHECK-LABEL: @test4(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %x, i1 false)
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; CHECK-NEXT: ret i16 [[VAR]]
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entry:
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%0 = tail call i16 @llvm.ctlz.i16(i16 %x, i1 true)
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%tobool = icmp eq i16 %x, 0
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%cond = select i1 %tobool, i16 16, i16 %0
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ret i16 %cond
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}
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define i32 @test5(i32 %x) {
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; CHECK-LABEL: @test5(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 false)
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; CHECK-NEXT: ret i32 [[VAR]]
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entry:
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%0 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
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%tobool = icmp eq i32 %x, 0
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%cond = select i1 %tobool, i32 32, i32 %0
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ret i32 %cond
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}
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define i64 @test6(i64 %x) {
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; CHECK-LABEL: @test6(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %x, i1 false)
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; CHECK-NEXT: ret i64 [[VAR]]
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entry:
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%0 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
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%tobool = icmp eq i64 %x, 0
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%cond = select i1 %tobool, i64 64, i64 %0
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ret i64 %cond
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}
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define i16 @test1b(i16 %x) {
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; CHECK-LABEL: @test1b(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %x, i1 false)
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; CHECK-NEXT: ret i16 [[VAR]]
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entry:
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%0 = tail call i16 @llvm.cttz.i16(i16 %x, i1 true)
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%tobool = icmp ne i16 %x, 0
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%cond = select i1 %tobool, i16 %0, i16 16
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ret i16 %cond
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}
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define i32 @test2b(i32 %x) {
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; CHECK-LABEL: @test2b(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: ret i32 [[VAR]]
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entry:
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%0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i32 %0, i32 32
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ret i32 %cond
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}
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define i64 @test3b(i64 %x) {
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; CHECK-LABEL: @test3b(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %x, i1 false)
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; CHECK-NEXT: ret i64 [[VAR]]
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entry:
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%0 = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
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%tobool = icmp ne i64 %x, 0
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%cond = select i1 %tobool, i64 %0, i64 64
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ret i64 %cond
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}
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define i16 @test4b(i16 %x) {
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; CHECK-LABEL: @test4b(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %x, i1 false)
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; CHECK-NEXT: ret i16 [[VAR]]
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entry:
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%0 = tail call i16 @llvm.cttz.i16(i16 %x, i1 true)
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%tobool = icmp eq i16 %x, 0
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%cond = select i1 %tobool, i16 16, i16 %0
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ret i16 %cond
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}
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define i32 @test5b(i32 %x) {
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; CHECK-LABEL: @test5b(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: ret i32 [[VAR]]
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entry:
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%0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
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%tobool = icmp eq i32 %x, 0
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%cond = select i1 %tobool, i32 32, i32 %0
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ret i32 %cond
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}
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define i64 @test6b(i64 %x) {
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; CHECK-LABEL: @test6b(
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; CHECK: [[VAR:%[a-zA-Z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %x, i1 false)
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; CHECK-NEXT: ret i64 [[VAR]]
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entry:
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%0 = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
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%tobool = icmp eq i64 %x, 0
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%cond = select i1 %tobool, i64 64, i64 %0
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ret i64 %cond
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}
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define i32 @test1c(i16 %x) {
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; CHECK-LABEL: @test1c(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i16 [[VAR1]] to i32
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; CHECK-NEXT: ret i32 [[VAR2]]
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entry:
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%0 = tail call i16 @llvm.cttz.i16(i16 %x, i1 true)
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%cast2 = zext i16 %0 to i32
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%tobool = icmp ne i16 %x, 0
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%cond = select i1 %tobool, i32 %cast2, i32 16
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ret i32 %cond
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}
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define i64 @test2c(i16 %x) {
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; CHECK-LABEL: @test2c(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i16 [[VAR1]] to i64
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; CHECK-NEXT: ret i64 [[VAR2]]
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entry:
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%0 = tail call i16 @llvm.cttz.i16(i16 %x, i1 true)
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%conv = zext i16 %0 to i64
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%tobool = icmp ne i16 %x, 0
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%cond = select i1 %tobool, i64 %conv, i64 16
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ret i64 %cond
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}
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define i64 @test3c(i32 %x) {
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; CHECK-LABEL: @test3c(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i32 [[VAR1]] to i64
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; CHECK-NEXT: ret i64 [[VAR2]]
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entry:
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%0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
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%conv = zext i32 %0 to i64
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i64 %conv, i64 32
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ret i64 %cond
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}
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define i32 @test4c(i16 %x) {
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; CHECK-LABEL: @test4c(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i16 [[VAR1]] to i32
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; CHECK-NEXT: ret i32 [[VAR2]]
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entry:
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%0 = tail call i16 @llvm.ctlz.i16(i16 %x, i1 true)
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%cast = zext i16 %0 to i32
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%tobool = icmp ne i16 %x, 0
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%cond = select i1 %tobool, i32 %cast, i32 16
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ret i32 %cond
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}
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define i64 @test5c(i16 %x) {
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; CHECK-LABEL: @test5c(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i16 [[VAR1]] to i64
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; CHECK-NEXT: ret i64 [[VAR2]]
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entry:
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%0 = tail call i16 @llvm.ctlz.i16(i16 %x, i1 true)
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%cast = zext i16 %0 to i64
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%tobool = icmp ne i16 %x, 0
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%cond = select i1 %tobool, i64 %cast, i64 16
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ret i64 %cond
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}
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define i64 @test6c(i32 %x) {
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; CHECK-LABEL: @test6c(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i32 [[VAR1]] to i64
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; CHECK-NEXT: ret i64 [[VAR2]]
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entry:
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%0 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
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%cast = zext i32 %0 to i64
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i64 %cast, i64 32
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ret i64 %cond
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}
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define i16 @test1d(i64 %x) {
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; CHECK-LABEL: @test1d(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i64 [[VAR1]] to i16
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; CHECK-NEXT: ret i16 [[VAR2]]
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entry:
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%0 = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
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%conv = trunc i64 %0 to i16
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%tobool = icmp ne i64 %x, 0
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%cond = select i1 %tobool, i16 %conv, i16 64
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ret i16 %cond
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}
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define i32 @test2d(i64 %x) {
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; CHECK-LABEL: @test2d(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i64 [[VAR1]] to i32
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; CHECK-NEXT: ret i32 [[VAR2]]
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entry:
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%0 = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
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%cast = trunc i64 %0 to i32
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%tobool = icmp ne i64 %x, 0
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%cond = select i1 %tobool, i32 %cast, i32 64
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ret i32 %cond
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}
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define i16 @test3d(i32 %x) {
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; CHECK-LABEL: @test3d(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i32 [[VAR1]] to i16
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; CHECK-NEXT: ret i16 [[VAR2]]
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entry:
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%0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
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%cast = trunc i32 %0 to i16
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i16 %cast, i16 32
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ret i16 %cond
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}
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define i16 @test4d(i64 %x) {
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; CHECK-LABEL: @test4d(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i64 [[VAR1]] to i16
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; CHECK-NEXT: ret i16 [[VAR2]]
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entry:
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%0 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
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%cast = trunc i64 %0 to i16
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%tobool = icmp ne i64 %x, 0
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%cond = select i1 %tobool, i16 %cast, i16 64
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ret i16 %cond
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}
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define i32 @test5d(i64 %x) {
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; CHECK-LABEL: @test5d(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i64 [[VAR1]] to i32
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; CHECK-NEXT: ret i32 [[VAR2]]
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entry:
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%0 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
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%cast = trunc i64 %0 to i32
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%tobool = icmp ne i64 %x, 0
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%cond = select i1 %tobool, i32 %cast, i32 64
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ret i32 %cond
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}
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define i16 @test6d(i32 %x) {
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; CHECK-LABEL: @test6d(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i32 [[VAR1]] to i16
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; CHECK-NEXT: ret i16 [[VAR2]]
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entry:
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%0 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
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%cast = trunc i32 %0 to i16
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i16 %cast, i16 32
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ret i16 %cond
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}
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define i64 @select_bug1(i32 %x) {
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; CHECK-LABEL: @select_bug1(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = zext i32 [[VAR1]] to i64
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; CHECK-NEXT: ret i64 [[VAR2]]
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entry:
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%0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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%conv = zext i32 %0 to i64
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i64 %conv, i64 32
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ret i64 %cond
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}
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define i16 @select_bug2(i32 %x) {
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; CHECK-LABEL: @select_bug2(
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; CHECK: [[VAR1:%[a-zA-Z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[VAR2:%[a-zA-Z0-9]+]] = trunc i32 [[VAR1]] to i16
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; CHECK-NEXT: ret i16 [[VAR2]]
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entry:
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%0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 false)
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%conv = trunc i32 %0 to i16
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%tobool = icmp ne i32 %x, 0
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%cond = select i1 %tobool, i16 %conv, i16 32
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ret i16 %cond
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}
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declare i16 @llvm.ctlz.i16(i16, i1)
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declare i32 @llvm.ctlz.i32(i32, i1)
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declare i64 @llvm.ctlz.i64(i64, i1)
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declare i16 @llvm.cttz.i16(i16, i1)
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declare i32 @llvm.cttz.i32(i32, i1)
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declare i64 @llvm.cttz.i64(i64, i1)
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