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c68299484e
This avoids us doing a completely unneeded "cmp r0, #0" after a flag-setting instruction if we only care about the Z or C flags. Add LSL/LSR to the whitelist while we're here and add testing. This code could really do with a spring clean. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281027 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
967 B
LLVM
58 lines
967 B
LLVM
; RUN: llc -mtriple=thumbv6m-eabi -verify-machineinstrs < %s | FileCheck %s
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; CHECK-LABEL: subs:
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; CHECK: subs
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; CHECK-NEXT: b{{eq|ne}}
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define i32 @subs(i32 %a, i32 %b) {
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%c = sub i32 %a, %b
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%d = icmp eq i32 %c, 0
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br i1 %d, label %true, label %false
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true:
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ret i32 4
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false:
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ret i32 5
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}
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; CHECK-LABEL: addsrr:
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; CHECK: adds
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; CHECK-NEXT: b{{eq|ne}}
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define i32 @addsrr(i32 %a, i32 %b) {
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%c = add i32 %a, %b
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%d = icmp eq i32 %c, 0
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br i1 %d, label %true, label %false
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true:
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ret i32 4
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false:
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ret i32 5
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}
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; CHECK-LABEL: lslri:
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; CHECK: lsls
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; CHECK-NEXT: b{{eq|ne}}
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define i32 @lslri(i32 %a, i32 %b) {
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%c = shl i32 %a, 3
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%d = icmp eq i32 %c, 0
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br i1 %d, label %true, label %false
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true:
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ret i32 4
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false:
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ret i32 5
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}
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; CHECK-LABEL: lslrr:
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; CHECK: lsls
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; CHECK-NEXT: b{{eq|ne}}
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define i32 @lslrr(i32 %a, i32 %b) {
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%c = shl i32 %a, %b
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%d = icmp eq i32 %c, 0
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br i1 %d, label %true, label %false
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true:
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ret i32 4
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false:
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ret i32 5
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}
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