db464a3dbf
https://reviews.llvm.org/D83833 Patch adds two new GICombinerRules for G_SELECT. The rules include: combining selects with undef comparisons into their first selectee value, and to combine away selects with constant comparisons. Patch additionally adds a new combiner test for the AArch64 target to test these new G_SELECT combiner rules and the existing select_same_val combiner rule. Patch by mkitzan
63 lines
2.0 KiB
YAML
63 lines
2.0 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs -mtriple aarch64-unknown-unknown %s -o - | FileCheck %s
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# RUN: llc -debugify-and-strip-all-safe -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs -mtriple aarch64-unknown-unknown %s -o - | FileCheck %s
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---
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# select (c, x, x) -> x
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name: test_combine_select_same_res
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body: |
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bb.1:
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liveins: $x0, $x1
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; CHECK-LABEL: name: test_combine_select_same_res
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; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
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; CHECK: $x0 = COPY [[COPY]](s64)
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%0:_(s64) = COPY $x0
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%1:_(s1) = G_TRUNC %0
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%2:_(s64) = G_SELECT %1, %0, %0
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$x0 = COPY %2(s64)
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...
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---
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# select (undef, x, y) -> y
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name: test_combine_select_undef_res0_res1
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body: |
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bb.1:
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liveins: $x0, $x1
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; CHECK-LABEL: name: test_combine_select_undef_res0_res1
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; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
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; CHECK: $x0 = COPY [[COPY]](s64)
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%0:_(s64) = COPY $x0
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%1:_(s64) = COPY $x1
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%2:_(s1) = G_IMPLICIT_DEF
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%3:_(s64) = G_SELECT %2, %0, %1
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$x0 = COPY %3(s64)
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...
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---
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# select (false, x, y) -> y
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name: test_combine_select_false_res0_res1
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body: |
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bb.1:
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liveins: $x0, $x1
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; CHECK-LABEL: name: test_combine_select_false_res0_res1
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; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x1
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; CHECK: $x0 = COPY [[COPY]](s64)
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%0:_(s64) = COPY $x0
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%1:_(s64) = COPY $x1
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%2:_(s1) = G_CONSTANT i1 false
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%3:_(s64) = G_SELECT %2, %0, %1
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$x0 = COPY %3(s64)
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...
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---
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# select (true, x, y) -> x
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name: test_combine_select_true_res0_res1
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body: |
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bb.1:
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liveins: $x0, $x1
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; CHECK-LABEL: name: test_combine_select_true_res0_res1
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; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
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; CHECK: $x0 = COPY [[COPY]](s64)
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%0:_(s64) = COPY $x0
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%1:_(s64) = COPY $x1
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%2:_(s1) = G_CONSTANT i1 true
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%3:_(s64) = G_SELECT %2, %0, %1
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$x0 = COPY %3(s64)
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...
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