From: Vladislav Egorov Date: Sun, 21 May 2017 20:49:17 +0000 (+0200) Subject: glcpp: Skip unnecessary line continuations removal X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4a47247523e678a3a9d3939e8a3c217188b99452;p=mesa.git glcpp: Skip unnecessary line continuations removal Overwhelming majority of shaders don't use line continuations. In my shader-db only shaders from the Talos Principle and Serious Sam used them, less than 1% out of all shaders. Optimize for this case, don't do any copying if no line continuation was found. Reviewed-by: Ian Romanick Reviewed-by: Timothy Arceri --- diff --git a/src/compiler/glsl/glcpp/pp.c b/src/compiler/glsl/glcpp/pp.c index c526f37719c..96125f2e2f1 100644 --- a/src/compiler/glsl/glcpp/pp.c +++ b/src/compiler/glsl/glcpp/pp.c @@ -117,6 +117,12 @@ remove_line_continuations(glcpp_parser_t *ctx, const char *shader) char newline_separator[3]; int collapsed_newlines = 0; + backslash = strchr(shader, '\\'); + + /* No line continuations were found in this shader, our job is done */ + if (backslash == NULL) + return (char *) shader; + search_start = shader; /* Determine what flavor of newlines this shader is using. GLSL @@ -157,8 +163,6 @@ remove_line_continuations(glcpp_parser_t *ctx, const char *shader) } while (true) { - backslash = strchr(search_start, '\\'); - /* If we have previously collapsed any line-continuations, * then we want to insert additional newlines at the next * occurrence of a newline character to avoid changing any @@ -204,6 +208,8 @@ remove_line_continuations(glcpp_parser_t *ctx, const char *shader) shader = skip_newline (backslash + 1); search_start = shader; } + + backslash = strchr(search_start, '\\'); } ralloc_strcat(&clean, shader);