60 lines
2.0 KiB
LLVM
60 lines
2.0 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; Ensure that volatile loads followed by a bitcast don't get transformed into a
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; volatile load of the bitcast-target type. This is unlikely to provide much in
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; terms of optimizations, and might break the programmer's expectation for code
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; generation, however brittle that expectation might be.
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;
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; See llvm.org/D75644 and llvm.org/D75505
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target datalayout = "e-p:64:64-i32:32:32-i64:64:64-f32:32:32-f64:64:64"
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define float @float_load(i32* %addr) {
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; CHECK-LABEL: @float_load(
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; CHECK: %i32 = load volatile i32, i32* %addr, align 4
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; CHECK-NEXT: %float = bitcast i32 %i32 to float
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; CHECK-NEXT: ret float %float
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%i32 = load volatile i32, i32* %addr, align 4
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%float = bitcast i32 %i32 to float
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ret float %float
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}
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define i32 @i32_load(float* %addr) {
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; CHECK-LABEL: @i32_load(
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; CHECK: %float = load volatile float, float* %addr, align 4
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; CHECK-NEXT: %i32 = bitcast float %float to i32
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; CHECK-NEXT: ret i32 %i32
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%float = load volatile float, float* %addr, align 4
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%i32 = bitcast float %float to i32
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ret i32 %i32
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}
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define double @double_load(i64* %addr) {
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; CHECK-LABEL: @double_load(
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; CHECK: %i64 = load volatile i64, i64* %addr, align 8
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; CHECK-NEXT: %double = bitcast i64 %i64 to double
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; CHECK-NEXT: ret double %double
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%i64 = load volatile i64, i64* %addr, align 8
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%double = bitcast i64 %i64 to double
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ret double %double
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}
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define i64 @i64_load(double* %addr) {
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; CHECK-LABEL: @i64_load(
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; CHECK: %double = load volatile double, double* %addr, align 8
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; CHECK-NEXT: %i64 = bitcast double %double to i64
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; CHECK-NEXT: ret i64 %i64
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%double = load volatile double, double* %addr, align 8
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%i64 = bitcast double %double to i64
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ret i64 %i64
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}
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define i8* @ptr_load(i64* %addr) {
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; CHECK-LABEL: @ptr_load(
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; CHECK: %i64 = load volatile i64, i64* %addr, align 8
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; CHECK-NEXT: %ptr = inttoptr i64 %i64 to i8*
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; CHECK-NEXT: ret i8* %ptr
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%i64 = load volatile i64, i64* %addr, align 8
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%ptr = inttoptr i64 %i64 to i8*
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ret i8* %ptr
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}
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