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52aa80b068
Although the final shifter operand is a rotate, this actually only matters for the half-word extends when the amount == 24. Otherwise folding a shift in is just as good. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213753 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
1.3 KiB
LLVM
58 lines
1.3 KiB
LLVM
; RUN: llc -mtriple=thumb-eabi -mcpu=cortex-a8 %s -o - | FileCheck %s --check-prefix=A8
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; RUN: llc -mtriple=thumb-eabi -mcpu=cortex-m3 %s -o - | FileCheck %s --check-prefix=M3
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; rdar://11318438
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define zeroext i8 @test1(i32 %A.u) {
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; A8: test1
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; A8: uxtb r0, r0
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%B.u = trunc i32 %A.u to i8
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ret i8 %B.u
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}
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define zeroext i32 @test2(i32 %A.u, i32 %B.u) {
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; A8: test2
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; A8: uxtab r0, r0, r1
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; M3: test2
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; M3: uxtb r1, r1
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; M3-NOT: uxtab
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; M3: add r0, r1
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%C.u = trunc i32 %B.u to i8
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%D.u = zext i8 %C.u to i32
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%E.u = add i32 %A.u, %D.u
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ret i32 %E.u
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}
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define zeroext i32 @test3(i32 %A.u) {
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; A8-LABEL: test3
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; A8: ubfx r0, r0, #8, #16
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%B.u = lshr i32 %A.u, 8
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%C.u = shl i32 %A.u, 24
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%D.u = or i32 %B.u, %C.u
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%E.u = trunc i32 %D.u to i16
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%F.u = zext i16 %E.u to i32
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ret i32 %F.u
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}
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define i32 @test4(i32 %A, i32 %X) {
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; A8-LABEL: test4:
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; A8: uxtab r0, r0, r1, ror #16
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%X.hi = lshr i32 %X, 16
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%X.trunc = trunc i32 %X.hi to i8
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%addend = zext i8 %X.trunc to i32
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%sum = add i32 %A, %addend
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ret i32 %sum
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}
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define i32 @test5(i32 %A, i32 %X) {
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; A8-LABEL: test5:
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; A8: uxtah r0, r0, r1, ror #8
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%X.hi = lshr i32 %X, 8
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%X.trunc = trunc i32 %X.hi to i16
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%addend = zext i16 %X.trunc to i32
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%sum = add i32 %A, %addend
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ret i32 %sum
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}
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