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