diff options
Diffstat (limited to 'test/codegen/README')
| -rw-r--r-- | test/codegen/README | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/test/codegen/README b/test/codegen/README index 33b9fbc49c..9345c67f5a 100644 --- a/test/codegen/README +++ b/test/codegen/README @@ -63,25 +63,26 @@ regexp will be matched against the code found on the same line: return math.Sqrt(x) // arm:"SQRTD" } -It's possible to specify a comma-separated list of regexps to be +It's possible to specify a space-separated list of regexps to be matched. For example, the following test: func TZ8(n uint8) int { - // amd64:"BSFQ","ORQ\t\\$256" + // amd64:"BSFL" "ORL [$]256" return bits.TrailingZeros8(n) } verifies that the code generated for a bits.TrailingZeros8 call on -amd64 contains both a "BSFQ" instruction and an "ORQ $256". +amd64 contains both a "BSFL" instruction and an "ORL $256". -Note how the ORQ regex includes a tab char (\t). In the Go assembly -syntax, operands are separated from opcodes by a tabulation. +Note that spaces are special - they will match any sequence of +whitespace (including tabs) in the printed assembly. Regexps can be quoted using either " or `. Special characters must be -escaped accordingly. Both of these are accepted, and equivalent: +escaped accordingly. All of these are accepted, and equivalent: - // amd64:"ADDQ\t\\$3" - // amd64:`ADDQ\t\$3` + // amd64:"ADDQ \\$3" + // amd64:`ADDQ \$3` + // amd64:"ADDQ [$]3" and they'll match this assembly line: @@ -102,7 +103,7 @@ The expected number of matches for the regexp can be specified using a positive number: func fb(a [4]int) (r [4]int) { - // amd64:2`MOVUPS[^,]+, X0$`,2`MOVUPS\sX0,[^\n]+$` + // amd64:2`MOVUPS[^,]+, X0$` 2`MOVUPS X0,[^\n]+$` return a } |