2011-08-16 00:09:40 +02:00
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; RUN: opt -S < %s -instcombine | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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; Check transforms involving atomic operations
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2016-04-21 18:51:08 +02:00
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define i32 @test1(i32* %p) {
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; CHECK-LABEL: define i32 @test1(
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; CHECK: %x = load atomic i32, i32* %p seq_cst, align 4
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; CHECK: shl i32 %x, 1
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%x = load atomic i32, i32* %p seq_cst, align 4
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%y = load i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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2011-08-17 01:29:17 +02:00
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define i32 @test2(i32* %p) {
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2013-07-14 03:50:49 +02:00
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; CHECK-LABEL: define i32 @test2(
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2016-04-21 18:51:08 +02:00
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; CHECK: %x = load volatile i32, i32* %p, align 4
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; CHECK: %y = load volatile i32, i32* %p, align 4
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%x = load volatile i32, i32* %p, align 4
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%y = load volatile i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; The exact semantics of mixing volatile and non-volatile on the same
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; memory location are a bit unclear, but conservatively, we know we don't
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; want to remove the volatile.
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define i32 @test3(i32* %p) {
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; CHECK-LABEL: define i32 @test3(
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; CHECK: %x = load volatile i32, i32* %p, align 4
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%x = load volatile i32, i32* %p, align 4
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%y = load i32, i32* %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; FIXME: Forwarding from a stronger atomic is fine
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define i32 @test4(i32* %p) {
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; CHECK-LABEL: define i32 @test4(
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2015-02-27 22:17:42 +01:00
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; CHECK: %x = load atomic i32, i32* %p seq_cst, align 4
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2016-04-21 18:51:08 +02:00
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; CHECK: %y = load atomic i32, i32* %p unordered, align 4
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2015-02-27 22:17:42 +01:00
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%x = load atomic i32, i32* %p seq_cst, align 4
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2016-04-21 18:51:08 +02:00
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%y = load atomic i32, i32* %p unordered, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding from a non-atomic is not. (The earlier load
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; could in priciple be promoted to atomic and then forwarded,
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; but we can't just drop the atomic from the load.)
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define i32 @test5(i32* %p) {
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; CHECK-LABEL: define i32 @test5(
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; CHECK: %x = load atomic i32, i32* %p unordered, align 4
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%x = load atomic i32, i32* %p unordered, align 4
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2015-02-27 22:17:42 +01:00
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%y = load i32, i32* %p, align 4
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2011-08-17 01:29:17 +02:00
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%z = add i32 %x, %y
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ret i32 %z
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}
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2016-04-21 18:51:08 +02:00
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