llvm/test/Transforms/SimplifyCFG/PR17073.ll
Sanjay Patel 80c193dec7 Fix for PR17073 ( http://llvm.org/pr17073 ), simplifycfg illegally hoists an operation in a phi node that can trap.
This patch adds to an existing loop over phi nodes in SimplifyCondBranchToCondBranch() to check for trapping ops and bails out of the optimization if we find one of those.

The test cases verify that trapping ops are not hoisted and non-trapping ops are still optimized as expected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212490 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-07 21:19:00 +00:00

74 lines
3.0 KiB
LLVM

; RUN: opt < %s -simplifycfg -S | FileCheck %s
; In PR17073 ( http://llvm.org/pr17073 ), we illegally hoisted an operation that can trap.
; The first test confirms that we don't do that when the trapping op is reached by the current BB (block1).
; The second test confirms that we don't do that when the trapping op is reached by the previous BB (entry).
; The third test confirms that we can still do this optimization for an operation (add) that doesn't trap.
; The tests must be complicated enough to prevent previous SimplifyCFG actions from optimizing away
; the instructions that we're checking for.
target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.9.0"
@a = common global i32 0, align 4
@b = common global i8 0, align 1
; CHECK-LABEL: can_trap1
; CHECK-NOT: or i1 %tobool, icmp eq (i32* bitcast (i8* @b to i32*), i32* @a)
; CHECK-NOT: select i1 %tobool, i32* null, i32* select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a)
define i32* @can_trap1() {
entry:
%0 = load i32* @a, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %exit, label %block1
block1:
br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2
block2:
br label %exit
exit:
%storemerge = phi i32* [ null, %entry ],[ null, %block2 ], [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %block1 ]
ret i32* %storemerge
}
; CHECK-LABEL: can_trap2
; CHECK-NOT: or i1 %tobool, icmp eq (i32* bitcast (i8* @b to i32*), i32* @a)
; CHECK-NOT: select i1 %tobool, i32* select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), i32* null
define i32* @can_trap2() {
entry:
%0 = load i32* @a, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %exit, label %block1
block1:
br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2
block2:
br label %exit
exit:
%storemerge = phi i32* [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %entry ],[ null, %block2 ], [ null, %block1 ]
ret i32* %storemerge
}
; CHECK-LABEL: cannot_trap
; CHECK: select i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), i32* select (i1 icmp eq (i64 add (i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64), i64 2), i64 0), i32* null, i32* @a), i32* null
define i32* @cannot_trap() {
entry:
%0 = load i32* @a, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %exit, label %block1
block1:
br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2
block2:
br label %exit
exit:
%storemerge = phi i32* [ null, %entry ],[ null, %block2 ], [ select (i1 icmp eq (i64 add (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %block1 ]
ret i32* %storemerge
}