| ; RUN: llc -verify-machineinstrs -o - %s -mtriple=aarch64-linux-gnu | FileCheck %s | |
| declare i32 @bar() | |
| declare i32 @baz() | |
| ; Check that the spill of the zero value gets stored directly instead | |
| ; of being copied from wzr and then stored. | |
| define i32 @test_zr_spill_fold1(i1 %c) { | |
| ; CHECK-LABEL: test_zr_spill_fold1: | |
| entry: | |
| br i1 %c, label %if.else, label %if.then | |
| if.else: | |
| ; CHECK: bl bar | |
| ; CHECK-NEXT: str w0, [sp, #[[SLOT:[0-9]+]]] | |
| %call1 = tail call i32 @bar() | |
| br label %if.end | |
| if.then: | |
| ; CHECK: bl baz | |
| ; CHECK-NEXT: str wzr, [sp, #[[SLOT]]] | |
| %call2 = tail call i32 @baz() | |
| br label %if.end | |
| if.end: | |
| %x.0 = phi i32 [ 0, %if.then ], [ %call1, %if.else ] | |
| call void asm sideeffect "", "~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{sp}"() nounwind | |
| ret i32 %x.0 | |
| } | |
| ; Similar to test_zr_spill_fold1, but with mis-matched register | |
| ; class between %x.0 and the 0 from %if.then. | |
| define i32 @test_zr_spill_fold2(i1 %c) { | |
| ; CHECK-LABEL: test_zr_spill_fold2: | |
| entry: | |
| br i1 %c, label %if.else, label %if.then | |
| if.else: | |
| ; CHECK: bl bar | |
| ; CHECK-NEXT: str w0, [sp, #[[SLOT:[0-9]+]]] | |
| %call1 = tail call i32 @bar() | |
| br label %if.end | |
| if.then: | |
| ; CHECK: bl baz | |
| ; CHECK-NEXT: str wzr, [sp, #[[SLOT]]] | |
| %call2 = tail call i32 @baz() | |
| br label %if.end | |
| if.end: | |
| %x.0 = phi i32 [ 0, %if.then ], [ %call1, %if.else ] | |
| call void asm sideeffect "", "~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{sp}"() nounwind | |
| %x.1 = add i32 %x.0, 1 | |
| ret i32 %x.1 | |
| } | |
| ; Similar to test_zr_spill_fold1, but with a cross register-class copy feeding a spill store. | |
| define float @test_cross_spill_fold(i32 %v) { | |
| ; CHECK-LABEL: test_cross_spill_fold: | |
| entry: | |
| ; CHECK: str w0, [sp, #[[SLOT:[0-9]+]]] | |
| %v.f = bitcast i32 %v to float | |
| call void asm sideeffect "", "~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{sp},~{s0},~{s1},~{s2},~{s3},~{s4},~{s5},~{s6},~{s7},~{s8},~{s9},~{s10},~{s11},~{s12},~{s13},~{s14},~{s15},~{s16},~{s17},~{s18},~{s19},~{s20},~{s21},~{s22},~{s23},~{s24},~{s25},~{s26},~{s27},~{s28},~{s29},~{s30},~{s31}"() nounwind | |
| ; CHECK: ldr s0, [sp, #[[SLOT]]] | |
| ret float %v.f | |
| } | |
| ; Similar to test_cross_spill_fold, but with a cross register-class copy fed by a refill load. | |
| define float @test_cross_spill_fold2(i32 %v) { | |
| ; CHECK-LABEL: test_cross_spill_fold2: | |
| entry: | |
| ; CHECK: str w0, [sp, #[[SLOT:[0-9]+]]] | |
| call void asm sideeffect "", "~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{sp},~{s0},~{s1},~{s2},~{s3},~{s4},~{s5},~{s6},~{s7},~{s8},~{s9},~{s10},~{s11},~{s12},~{s13},~{s14},~{s15},~{s16},~{s17},~{s18},~{s19},~{s20},~{s21},~{s22},~{s23},~{s24},~{s25},~{s26},~{s27},~{s28},~{s29},~{s30},~{s31}"() nounwind | |
| ; CHECK: ldr s0, [sp, #[[SLOT]]] | |
| %v.f = bitcast i32 %v to float | |
| ret float %v.f | |
| } | |