diff options
Diffstat (limited to 'test/Transforms/InstCombine/constant-fold-gep-overindex.ll')
| -rw-r--r-- | test/Transforms/InstCombine/constant-fold-gep-overindex.ll | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/test/Transforms/InstCombine/constant-fold-gep-overindex.ll b/test/Transforms/InstCombine/constant-fold-gep-overindex.ll index 15bdab4..954cccb 100644 --- a/test/Transforms/InstCombine/constant-fold-gep-overindex.ll +++ b/test/Transforms/InstCombine/constant-fold-gep-overindex.ll @@ -1,17 +1,33 @@ -; RUN: llvm-as < %s | opt -instcombine +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s + target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" target triple = "i386-apple-darwin10.0" %0 = type { i8*, [19 x i8] } %1 = type { i8*, [0 x i8] } +@array = external global [11 x i8] + @s = external global %0 ; <%0*> [#uses=1] @"\01LC8" = external constant [17 x i8] ; <[17 x i8]*> [#uses=1] +; Instcombine should be able to fold this getelementptr. + define i32 @main() nounwind { -entry: - %0 = call i32 (i8*, ...)* @printf(i8* getelementptr ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* getelementptr (%1* bitcast (%0* @s to %1*), i32 0, i32 1, i32 0)) nounwind ; <i32> [#uses=0] +; CHECK: call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* bitcast (i8** getelementptr (%1* bitcast (%0* @s to %1*), i32 1, i32 0) to i8*)) nounwind + + call i32 (i8*, ...)* @printf(i8* getelementptr ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* getelementptr (%1* bitcast (%0* @s to %1*), i32 0, i32 1, i32 0)) nounwind ; <i32> [#uses=0] ret i32 0 } +; Instcombine should constant-fold the GEP so that indices that have +; static array extents are within bounds of those array extents. +; In the below, -1 is not in the range [0,11). After the transformation, +; the same address is computed, but 3 is in the range of [0,11). + +define i8* @foo() nounwind { +; CHECK: ret i8* getelementptr ([11 x i8]* @array, i32 390451572, i32 3) + ret i8* getelementptr ([11 x i8]* @array, i32 0, i64 -1) +} + declare i32 @printf(i8*, ...) nounwind |