mirror of
https://github.com/c64scene-ar/llvm-6502.git
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e97c675022
Fixes radar 15486701. From: Fiona Glaser <fglaser@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229437 91177308-0d34-0410-b5e6-96231b3b80d8
185 lines
3.9 KiB
LLVM
185 lines
3.9 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK-LABEL: test1
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; CHECK: ret i1 true
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define i1 @test1(i8 %A) {
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%B = sitofp i8 %A to double
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%C = fcmp ult double %B, 128.0
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ret i1 %C
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}
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; CHECK-LABEL: test2
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; CHECK: ret i1 true
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define i1 @test2(i8 %A) {
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%B = sitofp i8 %A to double
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%C = fcmp ugt double %B, -128.1
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ret i1 %C
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}
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; CHECK-LABEL: test3
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; CHECK: ret i1 true
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define i1 @test3(i8 %A) {
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%B = sitofp i8 %A to double
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%C = fcmp ule double %B, 127.0
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ret i1 %C
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}
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; CHECK-LABEL: test4
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; CHECK: icmp ne i8 %A, 127
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; CHECK-NEXT: ret i1
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define i1 @test4(i8 %A) {
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%B = sitofp i8 %A to double
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%C = fcmp ult double %B, 127.0
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ret i1 %C
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}
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; CHECK-LABEL: test5
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; CHECK: ret i32
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define i32 @test5(i32 %A) {
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%B = sitofp i32 %A to double
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%C = fptosi double %B to i32
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%D = uitofp i32 %C to double
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%E = fptoui double %D to i32
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ret i32 %E
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}
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; CHECK-LABEL: test6
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; CHECK: and i32 %A, 39
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; CHECK-NEXT: ret i32
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define i32 @test6(i32 %A) {
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%B = and i32 %A, 7
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%C = and i32 %A, 32
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%D = sitofp i32 %B to double
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%E = sitofp i32 %C to double
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%F = fadd double %D, %E
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%G = fptosi double %F to i32
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ret i32 %G
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}
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; CHECK-LABEL: test7
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; CHECK: ret i32
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define i32 @test7(i32 %A) nounwind {
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%B = sitofp i32 %A to double
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%C = fptoui double %B to i32
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ret i32 %C
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}
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; CHECK-LABEL: test8
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; CHECK: ret i32
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define i32 @test8(i32 %A) nounwind {
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%B = uitofp i32 %A to double
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%C = fptosi double %B to i32
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ret i32 %C
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}
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; CHECK-LABEL: test9
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; CHECK: zext i8
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; CHECK-NEXT: ret i32
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define i32 @test9(i8 %A) nounwind {
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%B = sitofp i8 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; CHECK-LABEL: test10
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; CHECK: sext i8
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; CHECK-NEXT: ret i32
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define i32 @test10(i8 %A) nounwind {
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%B = sitofp i8 %A to float
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%C = fptosi float %B to i32
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ret i32 %C
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}
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; If the input value is outside of the range of the output cast, it's
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; undefined behavior, so we can assume it fits.
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; CHECK-LABEL: test11
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; CHECK: trunc
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; CHECK-NEXT: ret i8
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define i8 @test11(i32 %A) nounwind {
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%B = sitofp i32 %A to float
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%C = fptosi float %B to i8
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ret i8 %C
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}
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; If the input value is negative, it'll be outside the range of the
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; output cast, and thus undefined behavior.
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; CHECK-LABEL: test12
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; CHECK: zext i8
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; CHECK-NEXT: ret i32
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define i32 @test12(i8 %A) nounwind {
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%B = sitofp i8 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; This can't fold because the 25-bit input doesn't fit in the mantissa.
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; CHECK-LABEL: test13
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; CHECK: uitofp
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; CHECK-NEXT: fptoui
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define i32 @test13(i25 %A) nounwind {
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%B = uitofp i25 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; But this one can.
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; CHECK-LABEL: test14
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; CHECK: zext i24
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; CHECK-NEXT: ret i32
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define i32 @test14(i24 %A) nounwind {
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%B = uitofp i24 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; And this one can too.
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; CHECK-LABEL: test15
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; CHECK: trunc i32
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; CHECK-NEXT: ret i24
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define i24 @test15(i32 %A) nounwind {
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%B = uitofp i32 %A to float
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%C = fptoui float %B to i24
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ret i24 %C
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}
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; This can fold because the 25-bit input is signed and we disard the sign bit.
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; CHECK-LABEL: test16
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; CHECK: zext
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define i32 @test16(i25 %A) nounwind {
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%B = sitofp i25 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; This can't fold because the 26-bit input won't fit the mantissa
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; even after disarding the signed bit.
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; CHECK-LABEL: test17
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; CHECK: sitofp
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; CHECK-NEXT: fptoui
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define i32 @test17(i26 %A) nounwind {
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%B = sitofp i26 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; This can fold because the 54-bit output is signed and we disard the sign bit.
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; CHECK-LABEL: test18
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; CHECK: trunc
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define i54 @test18(i64 %A) nounwind {
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%B = sitofp i64 %A to double
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%C = fptosi double %B to i54
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ret i54 %C
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}
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; This can't fold because the 55-bit output won't fit the mantissa
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; even after disarding the sign bit.
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; CHECK-LABEL: test19
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; CHECK: sitofp
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; CHECK-NEXT: fptosi
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define i55 @test19(i64 %A) nounwind {
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%B = sitofp i64 %A to double
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%C = fptosi double %B to i55
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ret i55 %C
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}
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