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918871ee01
(eliminating some extends) if the new type of the computation is legal or if both the source and dest are illegal. This prevents instcombine from changing big chains of computation into i64 on 32-bit targets for example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86398 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
1.1 KiB
LLVM
42 lines
1.1 KiB
LLVM
; RUN: opt < %s -instcombine -S | 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"
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define i32 @mul(i32 %x, i32 %y) {
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%A = trunc i32 %x to i8
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%B = trunc i32 %y to i8
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%C = mul i8 %A, %B
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%D = zext i8 %C to i32
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ret i32 %D
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; CHECK: %C = mul i32 %x, %y
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; CHECK: %D = and i32 %C, 255
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; CHECK: ret i32 %D
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}
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define i32 @select1(i1 %cond, i32 %x, i32 %y, i32 %z) {
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%A = trunc i32 %x to i8
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%B = trunc i32 %y to i8
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%C = trunc i32 %z to i8
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%D = add i8 %A, %B
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%E = select i1 %cond, i8 %C, i8 %D
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%F = zext i8 %E to i32
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ret i32 %F
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; CHECK: %D = add i32 %x, %y
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; CHECK: %E = select i1 %cond, i32 %z, i32 %D
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; CHECK: %F = and i32 %E, 255
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; CHECK: ret i32 %F
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}
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define i8 @select2(i1 %cond, i8 %x, i8 %y, i8 %z) {
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%A = zext i8 %x to i32
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%B = zext i8 %y to i32
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%C = zext i8 %z to i32
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%D = add i32 %A, %B
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%E = select i1 %cond, i32 %C, i32 %D
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%F = trunc i32 %E to i8
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ret i8 %F
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; CHECK: %D = add i8 %x, %y
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; CHECK: %E = select i1 %cond, i8 %z, i8 %D
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; CHECK: ret i8 %E
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}
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