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ac3b4c962d
Adding LLVM back-end support to two intrinsics dealing with bit scan: _bit_scan_forward and _bit_scan_reverse. Their functionality is as described in Intel intrinsics guide: https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bit_scan_forward&expand=371,370 https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bit_scan_reverse&expand=371,370 Commit on behalf of Omer Paparo Bivas Differential Revision: http://reviews.llvm.org/D19915 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271386 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
729 B
LLVM
24 lines
729 B
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=corei7 | FileCheck %s --check-prefix=ALL --check-prefix=64-BIT
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; RUN: llc < %s -mtriple=i386-unknown-unknown -mcpu=corei7 | FileCheck %s --check-prefix=ALL --check-prefix=32-BIT
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declare i32 @llvm.x86.bit.scan.forward.32(i32 %val)
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declare i32 @llvm.x86.bit.scan.reverse.32(i32 %val)
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define i32 @test_bsf(i32 %val) {
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%call = call i32 @llvm.x86.bit.scan.forward.32(i32 %val)
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ret i32 %call
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; ALL-LABEL: test_bsf:
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; 64-BIT: bsfl %edi, %eax
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; 32-BIT: bsfl 4(%esp), %eax
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}
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define i32 @test_bsr(i32 %val) {
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%call = call i32 @llvm.x86.bit.scan.reverse.32(i32 %val)
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ret i32 %call
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; ALL-LABEL: test_bsr:
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; 64-BIT: bsrl %edi, %eax
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; 32-BIT: bsrl 4(%esp), %eax
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}
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