55 lines
2.0 KiB
LLVM
55 lines
2.0 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -mtriple=systemz-unknown -mcpu=z13 -O3 -enable-mssa-loop-dependency -disable-output %s
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; During transform to LCSSA, an access becomes obfuscated to:
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; (2 = phi (phi(val), val)), which BasicAA fails to analyze.
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; It's currently hard coded in BasicAA to return MayAlias for nested phis.
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; This leads MemorySSA to finding a new (false) clobber for a previously
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; optimized access. With verifyClobber included in verifyMemorySSA, such a
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; transformation will cause MemorySSA verification to fail.
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; If the verifyClobber is re-enabled, this test will crash.
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target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"
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target triple = "s390x-ibm-linux"
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%0 = type <{ i64, i8, i64, i16 }>
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@g_54 = external dso_local global i16, align 2
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@g_101 = external dso_local global <{ i64, i8, i64, i8, i8 }>, align 2
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declare dso_local void @safe_lshift_func_int16_t_s_s()
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declare dso_local i8 @safe_div_func_int8_t_s_s()
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define dso_local void @func_47(%0* %arg) {
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bb:
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%tmp = alloca i32, align 4
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br label %bb1
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bb1: ; preds = %bb12, %bb
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%tmp2 = getelementptr inbounds %0, %0* %arg, i32 0, i32 3
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store i16 undef, i16* %tmp2, align 1
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%tmp3 = call signext i8 @safe_div_func_int8_t_s_s()
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%tmp7 = icmp ne i8 %tmp3, 0
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br i1 %tmp7, label %bb8, label %bb10
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bb8: ; preds = %bb1
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%tmp9 = icmp eq i32 0, 0
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br i1 %tmp9, label %bb12, label %bb13
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bb10: ; preds = %bb10, %bb1
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call void @safe_lshift_func_int16_t_s_s()
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%tmp11 = getelementptr inbounds %0, %0* %arg, i32 0, i32 3
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store i16 0, i16* %tmp11, align 1
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store i8 0, i8* getelementptr inbounds (%0, %0* bitcast (<{ i64, i8, i64, i8, i8 }>* @g_101 to %0*), i32 0, i32 1), align 2
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br label %bb10
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bb12: ; preds = %bb8
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store i16 0, i16* @g_54, align 2
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br label %bb1
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bb13: ; preds = %bb8
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ret void
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}
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