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2534c6723e
Instead of treating the outlined functions for these as distinct frames, they should be combined into one case. Neither allows for stack fixups, and both generate the same frame. Thus, they ought to be considered one case. This makes the code far easier to understand, for one thing. It also offers some small code size improvements. It's fairly rare to see a class of outlined functions that doesn't fall entirely into one variant (on CTMark anyway). It does happen from time to time though. This mostly offers some serious simplification. Also update the test to show the added functionality. llvm-svn: 348036
129 lines
4.0 KiB
YAML
129 lines
4.0 KiB
YAML
# RUN: llc -mtriple=aarch64-apple-darwin -run-pass=prologepilog \
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# RUN: -run-pass=machine-outliner -verify-machineinstrs %s -o - | FileCheck %s
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# Check that we save LR to a callee-saved register when possible.
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# foo() should use a callee-saved register. However, bar() should not.
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--- |
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define void @foo() #0 {
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ret void
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}
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define void @bar() #0 {
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ret void
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}
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attributes #0 = { minsize noinline noredzone "no-frame-pointer-elim"="true" }
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...
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---
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# Make sure that when we outline and a register is available, we
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# use it to save + restore LR instead of SP.
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# Also make sure that we can call functions that require no save as the same
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# outlined function.
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# CHECK: name: foo
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# CHECK-DAG: bb.1
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# CHECK-DAG: $x[[REG:[0-9]+]] = ORRXrs $xzr, $lr, 0
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# CHECK-NEXT: BL
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# CHECK-NEXT: $lr = ORRXrs $xzr, $x[[REG]], 0
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# CHECK-DAG: bb.2
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# CHECK-DAG: $x[[REG]] = ORRXrs $xzr, $lr, 0
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# CHECK-NEXT: BL
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# CHECK-NEXT: $lr = ORRXrs $xzr, $x[[REG]], 0
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# CHECK-DAG: bb.3
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# CHECK-DAG: $x[[REG]] = ORRXrs $xzr, $lr, 0
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# CHECK-NEXT: BL
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# CHECK-NEXT: $lr = ORRXrs $xzr, $x[[REG]], 0
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# CHECK-DAG: bb.4
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# CHECK-NOT: $x[[REG]] = ORRXrs $xzr, $lr, 0
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# CHECK-DAG: BL
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name: foo
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tracksRegLiveness: true
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fixedStack:
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body: |
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bb.0:
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$x25 = ORRXri $xzr, 1
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$lr = ORRXri $xzr, 1
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bb.1:
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liveins: $lr, $w9
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 2
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bb.2:
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liveins: $lr, $w9
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 2
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bb.3:
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liveins: $lr, $w9
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 2
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bb.4:
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liveins: $lr, $w9
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 1
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$w9 = ORRWri $wzr, 2
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bb.5:
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liveins: $w9
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RET undef $lr
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...
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---
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# Convoluted case that shows that we'll still save to the stack when there are
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# no approprate registers available.
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# The live-in lists do not contain x16 or x17 since including them would cause
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# nothing to be outlined.
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# They also deliberately don't contain x18 to show that on Darwin we won't store
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# to that.
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# CHECK-LABEL: name: bar
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# CHECK: early-clobber $sp = STRXpre $lr, $sp, -16
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# CHECK-NEXT: BL
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# CHECK-DAG: early-clobber $sp, $lr = LDRXpost $sp, 16
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# CHECK: early-clobber $sp = STRXpre $lr, $sp, -16
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# CHECK-NEXT: BL
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# CHECK-DAG: early-clobber $sp, $lr = LDRXpost $sp, 16
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# CHECK: early-clobber $sp = STRXpre $lr, $sp, -16
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# CHECK-NEXT: BL
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# CHECK-NEXT: early-clobber $sp, $lr = LDRXpost $sp, 16
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name: bar
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w12 = ORRWri $wzr, 2
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bb.1:
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liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w12 = ORRWri $wzr, 2
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bb.2:
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liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w10 = ORRWri $wzr, 1
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$w12 = ORRWri $wzr, 2
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bb.3:
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liveins: $lr, $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x19, $x20, $x21, $x22, $x23, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
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RET undef $lr
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