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Diffstat (limited to 'test/Transforms/SimplifyCFG/PR17073.ll')
-rw-r--r-- | test/Transforms/SimplifyCFG/PR17073.ll | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/PR17073.ll b/test/Transforms/SimplifyCFG/PR17073.ll new file mode 100644 index 0000000..8dc9fb2 --- /dev/null +++ b/test/Transforms/SimplifyCFG/PR17073.ll @@ -0,0 +1,73 @@ +; 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 +} |