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https://github.com/c64scene-ar/llvm-6502.git
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710fc316fb
Teach selectBranch to fold bit test and branch into a single instruction (TBZ or TBNZ). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218010 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1022 B
LLVM
51 lines
1022 B
LLVM
; RUN: llc -fast-isel -fast-isel-abort -aarch64-atomic-cfg-tidy=0 -verify-machineinstrs -mtriple=aarch64-apple-darwin < %s | FileCheck %s
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define i32 @icmp_eq_i8(i8 zeroext %a) {
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; CHECK-LABEL: icmp_eq_i8
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; CHECK: tbz w0, #0, {{LBB.+_2}}
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%1 = and i8 %a, 1
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%2 = icmp eq i8 %1, 0
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br i1 %2, label %bb1, label %bb2
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bb2:
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ret i32 1
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bb1:
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ret i32 0
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}
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define i32 @icmp_eq_i16(i16 zeroext %a) {
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; CHECK-LABEL: icmp_eq_i16
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; CHECK: tbz w0, #1, {{LBB.+_2}}
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%1 = and i16 %a, 2
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%2 = icmp eq i16 %1, 0
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br i1 %2, label %bb1, label %bb2
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bb2:
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ret i32 1
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bb1:
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ret i32 0
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}
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define i32 @icmp_eq_i32(i32 %a) {
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; CHECK-LABEL: icmp_eq_i32
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; CHECK: tbz w0, #2, {{LBB.+_2}}
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%1 = and i32 %a, 4
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%2 = icmp eq i32 %1, 0
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br i1 %2, label %bb1, label %bb2
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bb2:
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ret i32 1
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bb1:
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ret i32 0
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}
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define i32 @icmp_eq_i64(i64 %a) {
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; CHECK-LABEL: icmp_eq_i64
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; CHECK: tbz x0, #3, {{LBB.+_2}}
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%1 = and i64 %a, 8
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%2 = icmp eq i64 %1, 0
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br i1 %2, label %bb1, label %bb2
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bb2:
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ret i32 1
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bb1:
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ret i32 0
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}
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