forked from OSchip/llvm-project
66 lines
2.0 KiB
LLVM
66 lines
2.0 KiB
LLVM
; This tests for various complex cast elimination cases instcombine should
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; handle.
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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"
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i1 @test1(i32 %X) {
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%A = bitcast i32 %X to i32 ; <i32> [#uses=1]
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; Convert to setne int %X, 12
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%c = icmp ne i32 %A, 12 ; <i1> [#uses=1]
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ret i1 %c
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; CHECK: %c = icmp ne i32 %X, 12
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; CHECK: ret i1 %c
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}
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define i1 @test2(i32 %X, i32 %Y) {
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%A = bitcast i32 %X to i32 ; <i32> [#uses=1]
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%B = bitcast i32 %Y to i32 ; <i32> [#uses=1]
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; Convert to setne int %X, %Y
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%c = icmp ne i32 %A, %B ; <i1> [#uses=1]
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ret i1 %c
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; CHECK: %c = icmp ne i32 %X, %Y
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; CHECK: ret i1 %c
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}
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define i32 @test4(i32 %A) {
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%B = bitcast i32 %A to i32 ; <i32> [#uses=1]
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%C = shl i32 %B, 2 ; <i32> [#uses=1]
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%D = bitcast i32 %C to i32 ; <i32> [#uses=1]
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ret i32 %D
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; CHECK: %C = shl i32 %A, 2
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; CHECK: ret i32 %C
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}
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define i16 @test5(i16 %A) {
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%B = sext i16 %A to i32 ; <i32> [#uses=1]
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%C = and i32 %B, 15 ; <i32> [#uses=1]
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%D = trunc i32 %C to i16 ; <i16> [#uses=1]
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ret i16 %D
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; CHECK: %C = and i16 %A, 15
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; CHECK: ret i16 %C
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}
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define i1 @test6(i1 %A) {
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%B = zext i1 %A to i32 ; <i32> [#uses=1]
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%C = icmp ne i32 %B, 0 ; <i1> [#uses=1]
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ret i1 %C
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; CHECK: ret i1 %A
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}
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define i1 @test6a(i1 %A) {
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%B = zext i1 %A to i32 ; <i32> [#uses=1]
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%C = icmp ne i32 %B, -1 ; <i1> [#uses=1]
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ret i1 %C
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; CHECK: ret i1 true
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}
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define i1 @test7(i8* %A) {
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%B = bitcast i8* %A to i32* ; <i32*> [#uses=1]
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%C = icmp eq i32* %B, null ; <i1> [#uses=1]
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ret i1 %C
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; CHECK: %C = icmp eq i8* %A, null
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; CHECK: ret i1 %C
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}
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