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33474b29b1
Summary: Optimize code generated for variable shifts/rotates by taking advantage of the implicit and/mod done on the variable shift amount register. Resolves bug 27582 and bug 37421. Reviewers: t.p.northover, qcolombet, MatzeB, javed.absar Subscribers: rengolin, kristof.beyls, mcrosier, llvm-commits Differential Revision: https://reviews.llvm.org/D46844 llvm-svn: 333214
59 lines
2.0 KiB
LLVM
59 lines
2.0 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-eabi -mcpu=cyclone | FileCheck %s
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define i128 @shl(i128 %r, i128 %s) nounwind readnone {
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; CHECK-LABEL: shl:
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; CHECK: neg [[REV_SHIFT:x[0-9]+]], x2
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; CHECK: lsr [[LO_FOR_HI_NORMAL:x[0-9]+]], x0, [[REV_SHIFT]]
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; CHECK: cmp x2, #0
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; CHECK: csel [[LO_FOR_HI:x[0-9]+]], xzr, [[LO_FOR_HI_NORMAL]], eq
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; CHECK: lsl [[HI_FOR_HI:x[0-9]+]], x1, x2
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; CHECK: orr [[HI_NORMAL:x[0-9]+]], [[LO_FOR_HI]], [[HI_FOR_HI]]
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; CHECK: lsl [[HI_BIG_SHIFT:x[0-9]+]], x0, x2
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; CHECK: sub [[EXTRA_SHIFT:x[0-9]+]], x2, #64
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; CHECK: cmp [[EXTRA_SHIFT]], #0
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; CHECK: csel x1, [[HI_BIG_SHIFT]], [[HI_NORMAL]], ge
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; CHECK: csel x0, xzr, [[HI_BIG_SHIFT]], ge
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; CHECK: ret
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%shl = shl i128 %r, %s
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ret i128 %shl
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}
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define i128 @ashr(i128 %r, i128 %s) nounwind readnone {
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; CHECK-LABEL: ashr:
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; CHECK: neg [[REV_SHIFT:x[0-9]+]], x2
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; CHECK: lsl [[HI_FOR_LO_NORMAL:x[0-9]+]], x1, [[REV_SHIFT]]
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; CHECK: cmp x2, #0
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; CHECK: csel [[HI_FOR_LO:x[0-9]+]], xzr, [[HI_FOR_LO_NORMAL]], eq
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; CHECK: lsr [[LO_FOR_LO:x[0-9]+]], x0, x2
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; CHECK: orr [[LO_NORMAL:x[0-9]+]], [[LO_FOR_LO]], [[HI_FOR_LO]]
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; CHECK: asr [[LO_BIG_SHIFT:x[0-9]+]], x1, x2
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; CHECK: sub [[EXTRA_SHIFT:x[0-9]+]], x2, #64
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; CHECK: cmp [[EXTRA_SHIFT]], #0
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; CHECK: csel x0, [[LO_BIG_SHIFT]], [[LO_NORMAL]], ge
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; CHECK: asr [[BIGSHIFT_HI:x[0-9]+]], x1, #63
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; CHECK: csel x1, [[BIGSHIFT_HI]], [[LO_BIG_SHIFT]], ge
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; CHECK: ret
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%shr = ashr i128 %r, %s
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ret i128 %shr
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}
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define i128 @lshr(i128 %r, i128 %s) nounwind readnone {
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; CHECK-LABEL: lshr:
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; CHECK: neg [[REV_SHIFT:x[0-9]+]], x2
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; CHECK: lsl [[HI_FOR_LO_NORMAL:x[0-9]+]], x1, [[REV_SHIFT]]
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; CHECK: cmp x2, #0
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; CHECK: csel [[HI_FOR_LO:x[0-9]+]], xzr, [[HI_FOR_LO_NORMAL]], eq
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; CHECK: lsr [[LO_FOR_LO:x[0-9]+]], x0, x2
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; CHECK: orr [[LO_NORMAL:x[0-9]+]], [[LO_FOR_LO]], [[HI_FOR_LO]]
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; CHECK: lsr [[LO_BIG_SHIFT:x[0-9]+]], x1, x2
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; CHECK: cmp [[EXTRA_SHIFT]], #0
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; CHECK: csel x0, [[LO_BIG_SHIFT]], [[LO_NORMAL]], ge
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; CHECK: csel x1, xzr, [[LO_BIG_SHIFT]], ge
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; CHECK: ret
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%shr = lshr i128 %r, %s
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ret i128 %shr
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}
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